python 根据出生日期判断年龄

问题：如何根据出生日期判断用户年龄？

解决：使用timedelta计算天数

方法：

# 根据生日计算用户年龄
def user_age(borndate):
    today = datetime.date.today()
    year = today.year
    born_year = borndate.year
    # 计算出生当年错过了多少天
    born_first_day = borndate.replace(month=1, day=1)
    born_diff = (borndate - born_first_day).days
    year_first_day = today.replace(month=1, day=1)
    today_diff = (today - year_first_day).days

    if today_diff > born_diff:
        return year - born_year
    else:
        return year - born_year - 1